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wyznacz x :
a) y=2(x-1) ,
y=2x-2
y+2=2x /:2
x=0,5y+1
wyznacz k :
b) a=xk+yk
a=k(x+y) /:(x+y)
a /(x+y)=k
c) b=2k-ak
b=k(2-a) /:(2-a)
b/(2-a)=k
d) c= ( k+1)b+2k
c=kb+b+2k
c-b=kb+2k
c-b=k(b+2) /:(b+2)
k=c-b /(b+2)
zad.2
P=(a*h) /2
2P=a*h /:h
a=2P/h